[drysumpjet]

Another post somewhere showed a block crack around the exhaust port area, which may have been caused from a stack installation that was poorly supported.

I'm not sure if my support is a "cure" for stacks, but it should help with block cracking concerns. The plate is 1/4" aluminum, note it's supported underneath by flatstock to where the Quietline lower muffler shield is attached to the block. (The block is from a 1650)

The stack pipe is made of scrap stainless steel swimming pool ladder pipe I polished. Too bad the engine ran "lean" and "blued" the pipe before I had a chance to drill out the main jet in the card to richen it up a bit.

It's also got the insert muffler inside the pipe as I mentioned on the old forum.